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B Michelson-Morley Exp. and Laws of Reflection

  1. Dec 21, 2017 #1
    Michelson-Morley Exp..png


    Hello there,
    I have a problem with this image from the Michelson Morley experiment in which one tries to calculate the time taken by the light beam to traverse the arm of interferometer perpendicular to the velocity of the frame in 'ether'.
    So the problem is, Are laws of reflection being followed where the light beam encounters the first mirror?. The angle of incidence does not appear to be equal to the angle of reflection.
    Any comments...
     
  2. jcsd
  3. Dec 21, 2017 #2

    mfb

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    The mirror is moving, in the reference frame of the mirror the reflection leaves under the angle you would expect.
     
  4. Dec 21, 2017 #3
    meaning, the laws of reflection are valid in the mirror frame of reference.
     
  5. Dec 21, 2017 #4

    mfb

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    Right. This reference frame is the lab frame, where we can check that the reflection works as expected.
     
  6. Dec 21, 2017 #5
    Thanx:smile:
     
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